The JBO Thread Ring Gauge (GO) – Metric Fine is a precision tool designed to verify external thread diameters with confidence. Crafted for professionals in manufacturing, machining, automotive, and quality control, this GO gauge helps you quickly determine whether a threaded component meets exact specifications. Its metric fine threading and 4h tolerance ensure reliable, repeatable checks for each part you inspect.

• Precise metric fine GO gauge (M42 x 1, 4h): delivers accurate go/no-go verification for external threads, enabling quick, consistent conformance checks that align with standard specifications.
• Hardened steel construction: provides exceptional wear resistance and long tool life, maintaining measurement accuracy even after heavy use in demanding work environments.
• User-friendly right-hand GO design: simplifies inspection workflows, helping operators identify compliant components at a glance and reduce inspection time.

Used in quality control and precision engineering, this gauge supports faster approvals, fewer reworks, and more reliable production outcomes. Its durable construction and straightforward use help you maintain tight tolerances across your threaded assemblies, delivering consistent results across shifts and jobs.